Skip to content
An egg casserole on a white plate and a fork
Breakfast

Cheesy Egg & Croissant Bake

By According to Elle

Time: 1.5 hours Serves: 6-8

Ingredients

  • 2 tablespoons olive oil 
  • 1 large yellow onion, sliced thinly 
  • 8 ounces white mushrooms, sliced 
  • 3 ounces (about 3 cups) fresh baby spinach 
  • 1 ½ cups shredded Gruyere cheese, or cheese of choice 
  • 12 eggs  
  • 1/2 cup Darigold FIT milk 
  • 1 tablespoon Dijon mustard 
  • 1 teaspoon salt 
  • 12 ounces croissants (about 4 large or 8 mini), cut into small pieces  
  • Everything But the Bagel Seasoning (optional) 

Instructions

  1. Caramelize the onions; saute the mushrooms and spinach. Heat the olive oil over medium-low heat in a large skillet. Add the onions and cook, stirring occasionally, until the onions are jammy and rich golden brown in color, about 45-60 minutes. Push the onions to the side of the skillet, increase heat to medium and add the mushrooms. Saute the mushrooms until most of their water has evaporated, about 5-10 minutes. Fold in the spinach and gently stir to combine onions and mushrooms. Remove from heat when the spinach has wilted. 
  2. Make the egg mixture. While the onions caramelize, combine the eggs, dijon mustard, salt, and milk. Whisk until well combined. 
  3. Layer your ingredients. Preheat the oven to 350°F. Lightly grease a 9×13 baking dish with melted butter. Spread the veggies evenly over the bottom of the pan followed by half of the cheese. Pour eggs over the veggies and top with the croissant pieces. Finish with the remaining cheese. 
  4. Bake. Loosely cover the pan with foil and bake until eggs are mostly set but still slightly jiggly in the center, about 30 minutes. Remove the foil and bake until the center is just set, about another 5-10 minutes. Top with Everything Bagel seasoning, if desired. Slice and serve! 

You May Also Like

View All
Waffles with cream and raspberries arranged on a white plate
Time: 30M | Serves: 4

Lemon Curd Waffles

Read More
French toast casserole in a white serving dish
Time: 40M | Serves: 8

French Toast Casserole

Read More
A bowl of oatmeal with blueberries, blackberries, strawberries and nuts
Time: 20M | Serves: 4

Old Fashioned Oatmeal Pudding

Read More